2 * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
3 * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
5 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
6 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
8 * Permission is hereby granted to use or copy this program
9 * for any purpose, provided the above notices are retained on all copies.
10 * Permission to modify the code and to distribute modified code is granted,
11 * provided the above notices are retained, and a notice that the code was
12 * modified is included with the above copyright notice.
14 /* Boehm, November 17, 1995 12:13 pm PST */
18 # include "private/gc_priv.h"
21 # if defined(OS2) || defined(CX_UX)
22 # define _setjmp(b) setjmp(b)
23 # define _longjmp(b,v) longjmp(b,v)
29 # include <machine/reg.h>
33 #if defined(__MWERKS__) && !defined(POWERPC)
35 asm static void PushMacRegisters()
37 sub.w #4,sp // reserve space for one parameter.
44 # if !__option(a6frames)
45 // <pcb> perhaps a6 should be pushed if stack frames are not being used.
49 // skip a5 (globals), a6 (frame pointer), and a7 (stack pointer)
62 add.w #4,sp // fix stack.
66 #endif /* __MWERKS__ */
68 # if defined(SPARC) || defined(IA64)
69 /* Value returned from register flushing routine; either sp (SPARC) */
70 /* or ar.bsp (IA64) */
71 word GC_save_regs_ret_val;
74 /* Routine to mark from registers that are preserved by the C compiler. */
75 /* This must be ported to every new architecture. There is a generic */
76 /* version at the end, that is likely, but not guaranteed to work */
77 /* on your architecture. Run the test_setjmp program to see whether */
78 /* there is any chance it will work. */
80 #if !defined(USE_GENERIC_PUSH_REGS) && !defined(USE_ASM_PUSH_REGS)
85 register long TMP_SP; /* must be bound to r11 */
89 /* VAX - generic code below does not work under 4.2 */
90 /* r1 through r5 are caller save, and therefore */
91 /* on the stack or dead. */
92 asm("pushl r11"); asm("calls $1,_GC_push_one");
93 asm("pushl r10"); asm("calls $1,_GC_push_one");
94 asm("pushl r9"); asm("calls $1,_GC_push_one");
95 asm("pushl r8"); asm("calls $1,_GC_push_one");
96 asm("pushl r7"); asm("calls $1,_GC_push_one");
97 asm("pushl r6"); asm("calls $1,_GC_push_one");
98 # define HAVE_PUSH_REGS
100 # if defined(M68K) && (defined(SUNOS4) || defined(NEXT))
101 /* M68K SUNOS - could be replaced by generic code */
102 /* a0, a1 and d1 are caller save */
103 /* and therefore are on stack or dead. */
105 asm("subqw #0x4,sp"); /* allocate word on top of stack */
107 asm("movl a2,sp@"); asm("jbsr _GC_push_one");
108 asm("movl a3,sp@"); asm("jbsr _GC_push_one");
109 asm("movl a4,sp@"); asm("jbsr _GC_push_one");
110 asm("movl a5,sp@"); asm("jbsr _GC_push_one");
111 /* Skip frame pointer and stack pointer */
112 asm("movl d1,sp@"); asm("jbsr _GC_push_one");
113 asm("movl d2,sp@"); asm("jbsr _GC_push_one");
114 asm("movl d3,sp@"); asm("jbsr _GC_push_one");
115 asm("movl d4,sp@"); asm("jbsr _GC_push_one");
116 asm("movl d5,sp@"); asm("jbsr _GC_push_one");
117 asm("movl d6,sp@"); asm("jbsr _GC_push_one");
118 asm("movl d7,sp@"); asm("jbsr _GC_push_one");
120 asm("addqw #0x4,sp"); /* put stack back where it was */
121 # define HAVE_PUSH_REGS
124 # if defined(M68K) && defined(HP)
125 /* M68K HP - could be replaced by generic code */
126 /* a0, a1 and d1 are caller save. */
128 asm("subq.w &0x4,%sp"); /* allocate word on top of stack */
130 asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one");
131 asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one");
132 asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one");
133 asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one");
134 /* Skip frame pointer and stack pointer */
135 asm("mov.l %d1,(%sp)"); asm("jsr _GC_push_one");
136 asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one");
137 asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one");
138 asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one");
139 asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one");
140 asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one");
141 asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one");
143 asm("addq.w &0x4,%sp"); /* put stack back where it was */
144 # define HAVE_PUSH_REGS
145 # endif /* M68K HP */
147 # if defined(M68K) && defined(AMIGA)
148 /* AMIGA - could be replaced by generic code */
149 /* a0, a1, d0 and d1 are caller save */
152 asm("subq.w &0x4,%sp"); /* allocate word on top of stack */
154 asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one");
155 asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one");
156 asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one");
157 asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one");
158 asm("mov.l %a6,(%sp)"); asm("jsr _GC_push_one");
159 /* Skip frame pointer and stack pointer */
160 asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one");
161 asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one");
162 asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one");
163 asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one");
164 asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one");
165 asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one");
167 asm("addq.w &0x4,%sp"); /* put stack back where it was */
168 # define HAVE_PUSH_REGS
169 # else /* !__GNUC__ */
170 GC_push_one(getreg(REG_A2));
171 GC_push_one(getreg(REG_A3));
173 /* Can probably be changed to #if 0 -Kjetil M. (a4=globals)*/
174 GC_push_one(getreg(REG_A4));
176 GC_push_one(getreg(REG_A5));
177 GC_push_one(getreg(REG_A6));
178 /* Skip stack pointer */
179 GC_push_one(getreg(REG_D2));
180 GC_push_one(getreg(REG_D3));
181 GC_push_one(getreg(REG_D4));
182 GC_push_one(getreg(REG_D5));
183 GC_push_one(getreg(REG_D6));
184 GC_push_one(getreg(REG_D7));
185 # define HAVE_PUSH_REGS
186 # endif /* !__GNUC__ */
189 # if defined(M68K) && defined(MACOS)
190 # if defined(THINK_C)
191 # define PushMacReg(reg) \
195 sub.w #4,sp ; reserve space for one parameter.
199 ; skip a5 (globals), a6 (frame pointer), and a7 (stack pointer)
206 add.w #4,sp ; fix stack.
208 # define HAVE_PUSH_REGS
210 # endif /* THINK_C */
211 # if defined(__MWERKS__)
213 # define HAVE_PUSH_REGS
214 # endif /* __MWERKS__ */
217 # if defined(I386) &&!defined(OS2) &&!defined(SVR4) \
218 && (defined(__MINGW32__) || !defined(MSWIN32)) \
219 && !defined(SCO) && !defined(SCO_ELF) \
220 && !(defined(LINUX) && defined(__ELF__)) \
221 && !(defined(FREEBSD) && defined(__ELF__)) \
222 && !(defined(NETBSD) && defined(__ELF__)) \
223 && !(defined(OPENBSD) && defined(__ELF__)) \
224 && !(defined(BEOS) && defined(__ELF__)) \
225 && !defined(DOS4GW) && !defined(HURD)
226 /* I386 code, generic code does not appear to work */
227 /* It does appear to work under OS2, and asms dont */
228 /* This is used for some 38g UNIX variants and for CYGWIN32 */
229 asm("pushl %eax"); asm("call _GC_push_one"); asm("addl $4,%esp");
230 asm("pushl %ecx"); asm("call _GC_push_one"); asm("addl $4,%esp");
231 asm("pushl %edx"); asm("call _GC_push_one"); asm("addl $4,%esp");
232 asm("pushl %ebp"); asm("call _GC_push_one"); asm("addl $4,%esp");
233 asm("pushl %esi"); asm("call _GC_push_one"); asm("addl $4,%esp");
234 asm("pushl %edi"); asm("call _GC_push_one"); asm("addl $4,%esp");
235 asm("pushl %ebx"); asm("call _GC_push_one"); asm("addl $4,%esp");
236 # define HAVE_PUSH_REGS
239 # if ( defined(I386) && defined(LINUX) && defined(__ELF__) ) \
240 || ( defined(I386) && defined(FREEBSD) && defined(__ELF__) ) \
241 || ( defined(I386) && defined(NETBSD) && defined(__ELF__) ) \
242 || ( defined(I386) && defined(OPENBSD) && defined(__ELF__) ) \
243 || ( defined(I386) && defined(HURD) && defined(__ELF__) ) \
244 || ( defined(I386) && defined(DGUX) )
246 /* This is modified for Linux with ELF (Note: _ELF_ only) */
247 /* This section handles FreeBSD with ELF. */
248 /* Eax is caller-save and dead here. Other caller-save */
249 /* registers could also be skipped. We assume there are no */
250 /* pointers in MMX registers, etc. */
251 /* We combine instructions in a single asm to prevent gcc from */
252 /* inserting code in the middle. */
253 asm("pushl %ecx; call GC_push_one; addl $4,%esp");
254 asm("pushl %edx; call GC_push_one; addl $4,%esp");
255 asm("pushl %ebp; call GC_push_one; addl $4,%esp");
256 asm("pushl %esi; call GC_push_one; addl $4,%esp");
257 asm("pushl %edi; call GC_push_one; addl $4,%esp");
258 asm("pushl %ebx; call GC_push_one; addl $4,%esp");
259 # define HAVE_PUSH_REGS
262 # if ( defined(I386) && defined(BEOS) && defined(__ELF__) )
263 /* As far as I can understand from */
264 /* http://www.beunited.org/articles/jbq/nasm.shtml, */
265 /* only ebp, esi, edi and ebx are not scratch. How MMX */
266 /* etc. registers should be treated, I have no idea. */
267 asm("pushl %ebp; call GC_push_one; addl $4,%esp");
268 asm("pushl %esi; call GC_push_one; addl $4,%esp");
269 asm("pushl %edi; call GC_push_one; addl $4,%esp");
270 asm("pushl %ebx; call GC_push_one; addl $4,%esp");
271 # define HAVE_PUSH_REGS
274 # if defined(I386) && defined(MSWIN32) && !defined(__MINGW32__) \
275 && !defined(USE_GENERIC)
276 /* I386 code, Microsoft variant */
278 __asm call GC_push_one
281 __asm call GC_push_one
284 __asm call GC_push_one
287 __asm call GC_push_one
290 __asm call GC_push_one
293 __asm call GC_push_one
296 __asm call GC_push_one
298 # define HAVE_PUSH_REGS
301 # if defined(I386) && (defined(SVR4) || defined(SCO) || defined(SCO_ELF))
302 /* I386 code, SVR4 variant, generic code does not appear to work */
303 asm("pushl %eax"); asm("call GC_push_one"); asm("addl $4,%esp");
304 asm("pushl %ebx"); asm("call GC_push_one"); asm("addl $4,%esp");
305 asm("pushl %ecx"); asm("call GC_push_one"); asm("addl $4,%esp");
306 asm("pushl %edx"); asm("call GC_push_one"); asm("addl $4,%esp");
307 asm("pushl %ebp"); asm("call GC_push_one"); asm("addl $4,%esp");
308 asm("pushl %esi"); asm("call GC_push_one"); asm("addl $4,%esp");
309 asm("pushl %edi"); asm("call GC_push_one"); asm("addl $4,%esp");
310 # define HAVE_PUSH_REGS
314 asm ("movd r3, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
315 asm ("movd r4, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
316 asm ("movd r5, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
317 asm ("movd r6, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
318 asm ("movd r7, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
319 # define HAVE_PUSH_REGS
323 GC_save_regs_ret_val = GC_save_regs_in_stack();
324 # define HAVE_PUSH_REGS
328 GC_push_one(TMP_SP); /* GC_push_one from r11 */
330 asm("cas r11, r6, r0"); GC_push_one(TMP_SP); /* r6 */
331 asm("cas r11, r7, r0"); GC_push_one(TMP_SP); /* through */
332 asm("cas r11, r8, r0"); GC_push_one(TMP_SP); /* r10 */
333 asm("cas r11, r9, r0"); GC_push_one(TMP_SP);
334 asm("cas r11, r10, r0"); GC_push_one(TMP_SP);
336 asm("cas r11, r12, r0"); GC_push_one(TMP_SP); /* r12 */
337 asm("cas r11, r13, r0"); GC_push_one(TMP_SP); /* through */
338 asm("cas r11, r14, r0"); GC_push_one(TMP_SP); /* r15 */
339 asm("cas r11, r15, r0"); GC_push_one(TMP_SP);
340 # define HAVE_PUSH_REGS
343 # if defined(M68K) && defined(SYSV)
344 /* Once again similar to SUN and HP, though setjmp appears to work.
348 asm("subqw #0x4,%sp"); /* allocate word on top of stack */
350 asm("movl %a2,%sp@"); asm("jbsr GC_push_one");
351 asm("movl %a3,%sp@"); asm("jbsr GC_push_one");
352 asm("movl %a4,%sp@"); asm("jbsr GC_push_one");
353 asm("movl %a5,%sp@"); asm("jbsr GC_push_one");
354 /* Skip frame pointer and stack pointer */
355 asm("movl %d1,%sp@"); asm("jbsr GC_push_one");
356 asm("movl %d2,%sp@"); asm("jbsr GC_push_one");
357 asm("movl %d3,%sp@"); asm("jbsr GC_push_one");
358 asm("movl %d4,%sp@"); asm("jbsr GC_push_one");
359 asm("movl %d5,%sp@"); asm("jbsr GC_push_one");
360 asm("movl %d6,%sp@"); asm("jbsr GC_push_one");
361 asm("movl %d7,%sp@"); asm("jbsr GC_push_one");
363 asm("addqw #0x4,%sp"); /* put stack back where it was */
364 # define HAVE_PUSH_REGS
365 # else /* !__GNUC__*/
366 asm("subq.w &0x4,%sp"); /* allocate word on top of stack */
368 asm("mov.l %a2,(%sp)"); asm("jsr GC_push_one");
369 asm("mov.l %a3,(%sp)"); asm("jsr GC_push_one");
370 asm("mov.l %a4,(%sp)"); asm("jsr GC_push_one");
371 asm("mov.l %a5,(%sp)"); asm("jsr GC_push_one");
372 /* Skip frame pointer and stack pointer */
373 asm("mov.l %d1,(%sp)"); asm("jsr GC_push_one");
374 asm("mov.l %d2,(%sp)"); asm("jsr GC_push_one");
375 asm("mov.l %d3,(%sp)"); asm("jsr GC_push_one");
376 asm("mov.l %d4,(%sp)"); asm("jsr GC_push_one");
377 asm("mov.l %d5,(%sp)"); asm("jsr GC_push_one");
378 asm("mov.l %d6,(%sp)"); asm("jsr GC_push_one");
379 asm("mov.l %d7,(%sp)"); asm("jsr GC_push_one");
381 asm("addq.w &0x4,%sp"); /* put stack back where it was */
382 # define HAVE_PUSH_REGS
383 # endif /* !__GNUC__ */
384 # endif /* M68K/SYSV */
388 register int * sp asm ("optop");
389 extern int *__libc_stack_end;
391 GC_push_all_stack (sp, __libc_stack_end);
392 # define HAVE_PUSH_REGS
393 /* Isn't this redundant with the code to push the stack? */
397 /* other machines... */
398 # if !defined(HAVE_PUSH_REGS)
399 --> We just generated an empty GC_push_regs, which
400 --> is almost certainly broken. Try defining
401 --> USE_GENERIC_PUSH_REGS instead.
404 #endif /* !USE_GENERIC_PUSH_REGS && !USE_ASM_PUSH_REGS */
406 #if defined(USE_GENERIC_PUSH_REGS)
407 void GC_generic_push_regs(cold_gc_frame)
413 # ifdef HAVE_BUILTIN_UNWIND_INIT
414 /* This was suggested by Richard Henderson as the way to */
415 /* force callee-save registers and register windows onto */
417 __builtin_unwind_init();
418 # else /* !HAVE_BUILTIN_UNWIND_INIT */
420 /* The idea is due to Parag Patel at HP. */
421 /* We're not sure whether he would like */
422 /* to be he acknowledged for it or not. */
424 register word * i = (word *) regs;
425 register ptr_t lim = (ptr_t)(regs) + (sizeof regs);
427 /* Setjmp doesn't always clear all of the buffer. */
428 /* That tends to preserve garbage. Clear it. */
429 for (; (char *)i < lim; i++) {
432 # if defined(POWERPC) || defined(MSWIN32) || defined(MSWINCE) \
433 || defined(UTS4) || defined(LINUX) || defined(EWS4800)
436 (void) _setjmp(regs);
437 /* We don't want to mess with signals. According to */
438 /* SUSV3, setjmp() may or may not save signal mask. */
439 /* _setjmp won't, but is less portable. */
441 # endif /* !HAVE_BUILTIN_UNWIND_INIT */
442 # if (defined(SPARC) && !defined(HAVE_BUILTIN_UNWIND_INIT)) \
444 /* On a register window machine, we need to save register */
445 /* contents on the stack for this to work. The setjmp */
446 /* is probably not needed on SPARC, since pointers are */
447 /* only stored in windowed or scratch registers. It is */
448 /* needed on IA64, since some non-windowed registers are */
451 GC_save_regs_ret_val = GC_save_regs_in_stack();
452 /* On IA64 gcc, could use __builtin_ia64_flushrs() and */
453 /* __builtin_ia64_flushrs(). The latter will be done */
454 /* implicitly by __builtin_unwind_init() for gcc3.0.1 */
458 GC_push_current_stack(cold_gc_frame);
459 /* Strongly discourage the compiler from treating the above */
460 /* as a tail-call, since that would pop the register */
461 /* contents before we get a chance to look at them. */
462 GC_noop1((word)(&dummy));
465 #endif /* USE_GENERIC_PUSH_REGS */
467 /* On register window machines, we need a way to force registers into */
468 /* the stack. Return sp. */
470 asm(" .seg \"text\"");
471 # if defined(SVR4) || defined(NETBSD)
472 asm(" .globl GC_save_regs_in_stack");
473 asm("GC_save_regs_in_stack:");
474 asm(" .type GC_save_regs_in_stack,#function");
476 asm(" .globl _GC_save_regs_in_stack");
477 asm("_GC_save_regs_in_stack:");
479 # if defined(__arch64__) || defined(__sparcv9)
480 asm(" save %sp,-128,%sp");
483 asm(" restore %sp,2047+128,%o0");
485 asm(" ta 0x3 ! ST_FLUSH_WINDOWS");
490 asm(" .GC_save_regs_in_stack_end:");
491 asm(" .size GC_save_regs_in_stack,.GC_save_regs_in_stack_end-GC_save_regs_in_stack");
494 word GC_save_regs_in_stack() { return(0 /* sp really */);}
498 /* On IA64, we also need to flush register windows. But they end */
499 /* up on the other side of the stack segment. */
500 /* Returns the backing store pointer for the register stack. */
501 /* We now implement this as a separate assembly file, since inline */
502 /* assembly code here doesn't work with either the Intel or HP */
513 asm(" .global GC_save_regs_in_stack");
514 asm(" .proc GC_save_regs_in_stack");
515 asm("GC_save_regs_in_stack:");
519 asm(" mov r8=ar.bsp");
520 asm(" br.ret.sptk.few rp");
521 asm(" .endp GC_save_regs_in_stack");
523 # if 0 /* Other alternatives that don't work on HP/UX */
524 word GC_save_regs_in_stack() {
526 __builtin_ia64_flushrs();
527 return __builtin_ia64_bsp();
532 _asm(" mov r8=ar.bsp");
533 _asm(" br.ret.sptk.few rp");
537 asm(" mov r8=ar.bsp");
538 asm(" br.ret.sptk.few rp");
545 /* GC_clear_stack_inner(arg, limit) clears stack area up to limit and */
546 /* returns arg. Stack clearing is crucial on SPARC, so we supply */
547 /* an assembly version that's more careful. Assumes limit is hotter */
548 /* than sp, and limit is 8 byte aligned. */
549 #if defined(ASM_CLEAR_CODE)
554 asm(".globl _GC_clear_stack_inner");
555 asm("_GC_clear_stack_inner:");
557 asm(".globl GC_clear_stack_inner");
558 asm("GC_clear_stack_inner:");
559 asm(".type GC_save_regs_in_stack,#function");
561 #if defined(__arch64__) || defined(__sparcv9)
562 asm("mov %sp,%o2"); /* Save sp */
563 asm("add %sp,2047-8,%o3"); /* p = sp+bias-8 */
564 asm("add %o1,-2047-192,%sp"); /* Move sp out of the way, */
565 /* so that traps still work. */
566 /* Includes some extra words */
567 /* so we can be sloppy below. */
569 asm("stx %g0,[%o3]"); /* *(long *)p = 0 */
571 asm("bgu,pt %xcc, loop"); /* if (p > limit) goto loop */
572 asm("add %o3,-8,%o3"); /* p -= 8 (delay slot) */
574 asm("mov %o2,%sp"); /* Restore sp., delay slot */
576 asm("mov %sp,%o2"); /* Save sp */
577 asm("add %sp,-8,%o3"); /* p = sp-8 */
578 asm("clr %g1"); /* [g0,g1] = 0 */
579 asm("add %o1,-0x60,%sp"); /* Move sp out of the way, */
580 /* so that traps still work. */
581 /* Includes some extra words */
582 /* so we can be sloppy below. */
584 asm("std %g0,[%o3]"); /* *(long long *)p = 0 */
586 asm("bgu loop "); /* if (p > limit) goto loop */
587 asm("add %o3,-8,%o3"); /* p -= 8 (delay slot) */
589 asm("mov %o2,%sp"); /* Restore sp., delay slot */
590 #endif /* old SPARC */
591 /* First argument = %o0 = return value */
593 asm(" .GC_clear_stack_inner_end:");
594 asm(" .size GC_clear_stack_inner,.GC_clear_stack_inner_end-GC_clear_stack_inner");
599 ptr_t GC_clear_stack_inner(arg, limit)
600 ptr_t arg; word limit;